people · May 22, 2026
QuestDB Releases 9.4.0 with Parquet Metadata Sidecar and Performance Speedups in GROUP BY and Joins
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The QuestDB team released version 9.4.0 on May 18, 2026. Each Parquet partition now includes a compact binary _pm sidecar file storing column descriptors, row-group byte ranges, encodings, and min/max statistics to enable row-group pruning without opening data files. Parallel keyed GROUP BY achieves up to 4.6x speedup on single-column count() queries over fixed-size keys, while hash finalizer and denser tables deliver 15-25% improvements on GROUP BY and hash-join workloads. The release also includes multiple SQL planner and WAL bug fixes.
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